Device for producing the reciprocating movement of the wire guide of a winding machine



United States Patent Inventor Carl Elis Insulander Hagersten, SwedenAppl. No. 714,280 Filed March 19, 1968 Patented Dec. 15, 1970 AssigneeTelefonaktiebolaget L M Ericsson Stockholm, Sweden a corporation ofSweden Priority May 12,1967

Sweden No. 6697/67 DEVICE FOR PRODUCING THE RECIPROCATING MOVEMENT OFTHE WIRE GUIDE OF A WINDING MACHINE 4 Claims, 4 Drawing Figs.

242/158, 74/25 Int. Cl B65h 54/30 Field o1'Search.. 242/43,

Primary Examiner- Stanley N. Gilreath Attorney-Hane & Baxley ABSTRACT: Adevice for uniformly winding a wire upon a bobbin has a frame structuremounting a wire guide for uniformly distributing the wire upon thebobbin. The frame structure is reciprocated through a distance ofpredetermined length. It is formed of two parallel bars which aresecured against lengthwise displacement relative to each other andalternately frictionally engaged by a cam rotatable about a stationaryaxis. These engagements cause reciprocating displacement of the framestructure and thus of the wire guide through the predetermined distanceduring each revolution of the cam.

DEVICE FOR PRODUCING THE RECIPROCATING MOVEMENT OF THE WIRE GUIDE OF AWINDING MACHINE The invention refers to a device for producing thereciprocating movement of the wire guide of a winding machine,especially of the kind used for winding of electric coils.

When winding an electric coil, for instance a-relay coil on a bobbinwith end flanges, it is important that the wire guide reverses itsmovement exactly in the moment the wire reaches the one end flange orthe other.

In a known device of the general kind above referred to a worm gearcomprising a left-hand screw and a right-hand screw alternately drivesthe wire guide in the one direction and the other. In another knowndevice the wire guide is controlled by means of a suitably shaped camdisc, which for each turn of the rotation drives the wire guide toandfro. These known devices are relatively complicated and have thedisadvantage that it is difficult to make an exact adjustment of theextreme positions of the wire guide.

It is a broad object of the invention to provide a very simple drivingdevice that has the advantage of an easy adjustment of the extremepositions of the wire guide. This is obtained by the wire guide beingmechanically connected to a couple of parallel, spaced-apart bars that,at least with respect to longitudinal movement, are rigidly coupledtogether, a rotatable semicircular cam disc being located in the spacebetween the bars, for rotational movement in a plane substantiallythrough the longitudinal center lines of the bars. The arrangement issuch that during one half revolution the cam disc engages one of thebars and during the second half revolution engages the other bar todrive the bars by friction and thereby moving the wire guide to and fro.Each bar has a stop cleat, adjustable in the longitudinal direction ofthe bar for cooperation with a stop surface on the cam disc, located atthe foremost edge as seen in the rotational movement of said cam disc,to reverse the longitudinal movement of the bars in predeterminedpositions.

The device will be further described by means of an embodiment withreference to the attached drawing in which FIG. 1 shows a lengthwise,partly sectional, diagrammatic view of a wire guide driving device withthe wire guide in one extreme position,

FIG. 2 is a cross-sectional view of the device according to FIG. 1 on anenlarged scale,

FIG. 3 is a fragmentary view of FIG. 1 showing the driving device in anintermediate position, and

FIG. 4 is a fragmentary view similar to FIG. 3 and showing the drivingdevice in the other extreme position. i

In FIG. 1 there is shown a wire guide 1 for guiding a wire 2 that,coming from a wire supply spool 3, is wound onto a bobbin 4 whenrotated. During the winding of the wire onto the bobbin which hasflanges 5 and 6 the wire guide must be axially reciprocated with an evenspeed between two extreme positions, so that the wire is evenly wound onthe bobbin.

For this purpose, the wire guide is fixed to one end ofa bar 7 of adriving device. The bar is guided between rollers 7a and mounted inparallel with a second bar 8. The bars are prevented, by means of twocrosswise connection pieces 9 and 10, from moving lengthwise relative toeach other thereby constituting a frame structure. Bar 8 is biasedtowards bar 7 by means of springs 17a and 18a biasing bolts 17 and 18.On a rotary shaft 12 located perpendicularly to the plane of the bars iskeyed a semicircular cam disc 11, and on either side of the cam discthere are arranged two support wheels 13 and 14, mounted on ballbearings 25 and 26 and'defming support paths 15 and 16 for the bars 7and 8. The radii of the support paths are somewhat smaller than theradius of the cam disc 11 (see FIG. 2) so that during the rotation ofthe shaft the cam disc during one-half of each turn lifts the one barfrom the support paths and during the other half turn lifts the otherbar. As shown, the radius of support path 15 is such that there isalways a gap 31 between crossbars 9 and and bar 8. Assummg, by wa ofexample that wire guide I is somewhat to the le t from t e position 5own 1n Fl l and IS moving toward the left. During this movement, disc 11is in pressure engagement with bar 7 but not with bar 8. When the wireguide reaches the position of FIG. 1, the disc is in pressure engagementwith both bars for the short time until the reverse movement begins. Thetwo bars are now spread apart and hence, bar 7 together with pieces 9and 10, is lifted. The lifting distance is a very short one, in practiceless than 1 mm. The bar can be lifted through such short distance inspite of the restraint by guide rolls 7a. The bar lifted by the cam discis lengthwise displaced by the friction between the respective bar andthe cam disc as provided by the spring-loaded bolts 17 and 18, in thetangential direction of the disc, the other bar following in the samedirection resting upon the support paths. Thus the wire guide obtainsthe required reciprocating movement.

In order to permit adjustment of the device, so that the wire guidereverses its movement exactly in the positions in which the wire reachesthe inner sides of the flanges 5 and 6 of the bobbin, that is, withoutcontinued inertia movement, each bar is provided with a stop cleat l9and 20 respectively, each of which is fastened to the bars, in a mannersuch that it can be adjusted to a desired position lengthwise of the baras is indicated by a slot 30 in the bars. The wire guide 6 alwaysreverses its movement when the front edge 21 of the cam disc engages therespective stop cleat 19 or 20.

Iclaim:

1. A device for uniformly winding a wire upon a bobbin, said devicecomprising in combination:

a wire guide for uniformly distributing the wire upon a bobbin;and

a driving means for imparting to the wire guide a reciprocating movementof a predetermined stroke length, said driving means including:

a frame structure comprised of two parallel bars spaced apart andsecured against lengthwise displacement relative to each other by crossbars permitting limited movement of the parallel bars toward and awayfrom each other, and spring means biasing said parallel bars toward eachother, said wire guidebeing secured to said frame structure; and

a cam means mounted between said parallel bars unidirectionallyrotatable about an axis normal to the length of the bars, said cam meanshaving a circumferentially elongate camming surface alternately engagingthe parallel bars with frictional pressure engagement during one-half ofeach revolution of the cam means, each of the intermittent pressureengagements causing lengthwise displacement of the engaged one of thebars in opposite direction by a distance determined by thecircumferential length of the camming surface, the respective nonengagedbar automatically following such displacement whereby the framestructure and the winding guide secured thereto are reciprocated by saiddistance.

2. The device according to claim 1 and comprising a pair of stop means,each lengthwise displaceably mounted on one of said bars, said stopmeans arresting the lengthwise displacement of the frame structurerelative to the rotary cam means at selected positions in eitherdirection.

3. The device according to claim 1 and comprising a rotary shafttransversely extending through the frame structure between the twoparallel bars thereof, said cam means being seated on said shaft forsaid alternate coaction with said bars, and a pair of support wheelsmounted on said shaft on opposite sides of the cam means and protrudingbeyond the edges of the parallel bars for guiding said bars as the framestructure is lengthwise reciprocated relative to the cam means.

4. The device according to claim 1 wherein one of said parallel bars islengthwise extended beyond the other bar, said extension mounting saidwire guide.

